AmbientLightSensor.illuminance

The illuminance property of the AmbientLightSensor interface returns the current light level in lux of the ambient light level around the hosting device.

If a feature policy blocks use of a feature it is because your code is inconsistent with the policies set on your server. This is not something that would ever be shown to a user. See Feature-Policy for implementation insfructions.

Syntax

var level = AmbientLightSensor.illuminance

Value

A Number indicating the current light level in lux.

Example

if ( 'AmbientLightSensor' in window ) {
  const sensor = new AmbientLightSensor();
  sensor.onreading = () => {
    console.log('Current light level:', sensor.illuminance);
  };
  sensor.onerror = (event) => {
    console.log(event.error.name, event.error.message);
  };
  sensor.start();
}

Specifications

Specification Status Comment
Generic Sensor API Candidate Recommendation Defines sensors in general.
Ambient Light Sensor
The definition of 'illuminance' in that specification.
Candidate Recommendation  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic supportChrome Full support 54
Full support 54
Full support 69
Notes
Notes Based on Generic Sensor API.
Edge ? Firefox ? IE ? Opera Full support 56Safari ? WebView Android Full support 54
Full support 54
Full support 69
Notes
Notes Based on Generic Sensor API.
Chrome Android Full support 54
Full support 54
Full support 69
Notes
Notes Based on Generic Sensor API.
Edge Mobile ? Firefox Android ? Opera Android Full support 56Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown
See implementation notes.
See implementation notes.

Document Tags and Contributors

Contributors to this page: jpmedley, connorshea, fscholz, david_ross
Last updated by: jpmedley,